Umbrella shaft



FIG. 1 is a perspective view of an umbrella shaft showing my new design;

FIG. 2 is a front plan view thereof;

FIG. 3 is a rear plan view thereof;

FIG. 4 is an enlarged left side plan view thereof;

FIG. 5 is an enlarged right side plan view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an enlarged side view of the concentric segments of the shaft shown separately for clarity of illustration. 

The ornamental design for an umbrella shaft, as shown and described. 